Pressure acid leaching of Caldag lateritic nickel ore: An alternative to heap leaching

Date

2014-02-01

Author

Onal, Mehmet Ali Recai
Topkaya, Yavuz Ali

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In this study, the leachability of Caldag lateritic nickel ore under high pressure acid leaching (HPAL) conditions was investigated. Several HPAL parameters were tested in a comparative manner since in many cases, the extraction efficiencies of Caldag ore sample were more than 90% for nickel and cobalt. After the optimization of the process parameters, it was found that 94.1% nickel and 94.0% cobalt could be extracted under the conditions of 325 kg sulfuric acid/tonne of dry ore, 250 degrees C leaching temperature, 1 h leaching duration and 100% - 1 mm particle size. Under these conditions, scandium also present in the ore was highly extracted into the pregnant leach solution. The results obtained were compared with the reported pilot plant testing results of atmospheric heap leaching by European Nickel PLC.

Subject Keywords

Industrial and Manufacturing Engineering, Materials Chemistry, Metals and Alloys

URI

https://hdl.handle.net/11511/38797

Journal

HYDROMETALLURGY

DOI

https://doi.org/10.1016/j.hydromet.2013.11.011

Collections

Department of Metallurgical and Materials Engineering, Article

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Citation Formats

M. A. R. Onal and Y. A. Topkaya, “Pressure acid leaching of Caldag lateritic nickel ore: An alternative to heap leaching,” HYDROMETALLURGY, pp. 98–107, 2014, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/38797.